Highly selective synthesis of [(perfluoroalkyl) methyl] oxiranes (by the addition of iodoperfluoroalkanes to allyl acetate)
摘要:
Mixtures of regioisomeric adducts of monoiodoperfluoroalkanes R-F-I (R-F = C4F9, C6F13 C8F17) with allyl acetate, RFCH2CHICH2OAc (1a-1c) and rearranged adducts RFCH2CH(OAc)-CH2I (2a-2c), were converted chemoselectively to the corresponding oxiranes RFCH2CH(-O-)CH2 (3a-3c) in yields of 94-96% (total yields of the two-step synthesis starting from R-F-I were 85-87%). The chemoselectivity of the oxirane formation appeared to be very dependent on the solvent used. Dependence on the reaction conditions on formation of byproducts RFCH=CHCH2OAc (4a-4c) and RFCH=CHCH2OH (5a-5c) in the epoxidation reaction was studied. (C) 1997 Elsevier Science S.A.
POLYCARBONATE-BASE POLYMER, PRODUCTION PROCESS, RESIN COATING FLUID PREPARED THEREFROM, AND ELECTROPHOTOGRAPHIC PHOTORECEPTOR PREPARED THEREFROM
申请人:IDEMITSU KOSAN COMPANY LIMITED
公开号:EP0837085A1
公开(公告)日:1998-04-22
A polymer comprising mainly repeating units (1) and/or repeating units (2), containing optionally terminal groups (3) and/or repeating units (4), and having a reduced viscosity [ηsp/c] of 0.2 to 10.0 dl/g as measured in a 0.5 g/dl solution thereof in methylene chloride at 20°C; a resin coating fluid containing the polymer, a charge-transfer substance and a solvent; and an electrophotographic photoreceptor containing the polymer as a binder resin in a photosensitive layer, wherein Rf1 represents a group that is composed of at least carbon atoms and fluorine atoms and bonded directly to the two oxygen atoms of the carbonate linkage in the general formula (1) without any intervening arylene group; and Rf2 represents a group that is composed of at least carbon atoms and fluorine atoms and bonded directly to one of the oxygen atoms of the carbonate linkage in the general formula (3) without any intervening arylene group.
Novel aerosol formulation containing a polar fluorinated molecule
申请人:——
公开号:US20030194378A1
公开(公告)日:2003-10-16
The present invention relates to a stable pharmaceutical aerosol formulation intended for inhalation. The formulation contains an active substance, an aerosol propellant, a polar flurorinated molecule and an excipient. The preferred propellant is HFA 134a or HFA 227 or a mixture thereof.
NOVEL AEROSOL FORMULATION CONTAINING A POLAR FLUORINATED MOLECULE
申请人:AstraZeneca AB
公开号:EP1303258A1
公开(公告)日:2003-04-23
Polymer, top coating layer, top coating composition and immersion lithography process using the same
申请人:Hata Mitsuhiro
公开号:US20070155925A1
公开(公告)日:2007-07-05
A polymer, a top coating layer, a top coating composition and an immersion lithography process using the same are disclosed. The top coating layer polymer may include a deuterated carboxyl group having a desired acidity such that the top coating layer polymer may be insoluble with water and a photoresist, and soluble in a developer. The polymer may be included in a top coating layer and a top coating composition.